3605281 has 2 divisors, whose sum is σ = 3605282. Its totient is φ = 3605280.

The previous prime is 3605279. The next prime is 3605291. The reversal of 3605281 is 1825063.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2005056 + 1600225 = 1416^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 3605281 - 2¹ = 3605279 is a prime.

It is a super-2 number, since 2×3605281² = 25996102177922, which contains 22 as substring.

Together with 3605279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3605201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1802640 + 1802641.

It is an arithmetic number, because the mean of its divisors is an integer number (1802641).

Almost surely, 2^3605281 is an apocalyptic number.

It is an amenable number.

3605281 is a deficient number, since it is larger than the sum of its proper divisors (1).

3605281 is an equidigital number, since it uses as much as digits as its factorization.

3605281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 3605281 is about 1898.7577517946. The cubic root of 3605281 is about 153.3367920875.

It can be divided in two parts, 3 and 605281, that added together give a square (605284 = 778²).

The spelling of 3605281 in words is "three million, six hundred five thousand, two hundred eighty-one".